let S1, S2, S be non empty non void Circuit-like ManySortedSign ; ( InputVertices S1 misses InnerVertices S2 & InputVertices S2 misses InnerVertices S1 & S = S1 +* S2 implies for A1 being non-empty Circuit of S1
for A2 being non-empty Circuit of S2
for A being non-empty Circuit of S st A1 tolerates A2 & A = A1 +* A2 holds
for s being State of A
for s1 being State of A1 st s1 = s | the carrier of S1 holds
for s2 being State of A2 st s2 = s | the carrier of S2 holds
for n being natural Number holds Following (s,n) = (Following (s1,n)) +* (Following (s2,n)) )
assume that
A1:
InputVertices S1 misses InnerVertices S2
and
A2:
InputVertices S2 misses InnerVertices S1
and
A3:
S = S1 +* S2
; for A1 being non-empty Circuit of S1
for A2 being non-empty Circuit of S2
for A being non-empty Circuit of S st A1 tolerates A2 & A = A1 +* A2 holds
for s being State of A
for s1 being State of A1 st s1 = s | the carrier of S1 holds
for s2 being State of A2 st s2 = s | the carrier of S2 holds
for n being natural Number holds Following (s,n) = (Following (s1,n)) +* (Following (s2,n))
let A1 be non-empty Circuit of S1; for A2 being non-empty Circuit of S2
for A being non-empty Circuit of S st A1 tolerates A2 & A = A1 +* A2 holds
for s being State of A
for s1 being State of A1 st s1 = s | the carrier of S1 holds
for s2 being State of A2 st s2 = s | the carrier of S2 holds
for n being natural Number holds Following (s,n) = (Following (s1,n)) +* (Following (s2,n))
let A2 be non-empty Circuit of S2; for A being non-empty Circuit of S st A1 tolerates A2 & A = A1 +* A2 holds
for s being State of A
for s1 being State of A1 st s1 = s | the carrier of S1 holds
for s2 being State of A2 st s2 = s | the carrier of S2 holds
for n being natural Number holds Following (s,n) = (Following (s1,n)) +* (Following (s2,n))
let A be non-empty Circuit of S; ( A1 tolerates A2 & A = A1 +* A2 implies for s being State of A
for s1 being State of A1 st s1 = s | the carrier of S1 holds
for s2 being State of A2 st s2 = s | the carrier of S2 holds
for n being natural Number holds Following (s,n) = (Following (s1,n)) +* (Following (s2,n)) )
assume that
A4:
A1 tolerates A2
and
A5:
A = A1 +* A2
; for s being State of A
for s1 being State of A1 st s1 = s | the carrier of S1 holds
for s2 being State of A2 st s2 = s | the carrier of S2 holds
for n being natural Number holds Following (s,n) = (Following (s1,n)) +* (Following (s2,n))
let s be State of A; for s1 being State of A1 st s1 = s | the carrier of S1 holds
for s2 being State of A2 st s2 = s | the carrier of S2 holds
for n being natural Number holds Following (s,n) = (Following (s1,n)) +* (Following (s2,n))
let s1 be State of A1; ( s1 = s | the carrier of S1 implies for s2 being State of A2 st s2 = s | the carrier of S2 holds
for n being natural Number holds Following (s,n) = (Following (s1,n)) +* (Following (s2,n)) )
assume A6:
s1 = s | the carrier of S1
; for s2 being State of A2 st s2 = s | the carrier of S2 holds
for n being natural Number holds Following (s,n) = (Following (s1,n)) +* (Following (s2,n))
let s2 be State of A2; ( s2 = s | the carrier of S2 implies for n being natural Number holds Following (s,n) = (Following (s1,n)) +* (Following (s2,n)) )
assume A7:
s2 = s | the carrier of S2
; for n being natural Number holds Following (s,n) = (Following (s1,n)) +* (Following (s2,n))
let n be natural Number ; Following (s,n) = (Following (s1,n)) +* (Following (s2,n))
A8:
(Following (s,n)) | the carrier of S1 = Following (s1,n)
by A1, A3, A4, A5, A6, Th13;
A9:
( dom (Following (s,n)) = the carrier of S & the carrier of S = the carrier of S1 \/ the carrier of S2 )
by A3, CIRCCOMB:def 2, CIRCUIT1:3;
S1 tolerates S2
by A4, CIRCCOMB:def 3;
then A10:
S1 +* S2 = S2 +* S1
by CIRCCOMB:5;
A1 +* A2 = A2 +* A1
by A4, CIRCCOMB:22;
then
(Following (s,n)) | the carrier of S2 = Following (s2,n)
by A2, A3, A4, A5, A7, A10, Th13, CIRCCOMB:19;
hence
Following (s,n) = (Following (s1,n)) +* (Following (s2,n))
by A8, A9, FUNCT_4:70; verum